US2009018296A1PendingUtilityA1

Norbornene Addition Copolymer and Moldings

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Assignee: ZEON CORPPriority: Mar 25, 2005Filed: Mar 24, 2006Published: Jan 15, 2009
Est. expiryMar 25, 2025(expired)· nominal 20-yr term from priority
Inventors:Shintaro IkedaKei NishiiYasuo Tsunogae
C08F 212/08C08F 232/08C08F 210/02C08F 212/02
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Claims

Abstract

A norbornene addition copolymer obtained by subjecting a norbornene monomer (A), an aromatic vinyl compound (B), and an α-olefin having 2 to 20 cabon atoms (C) to addition copolymerization, the sum of the content of repeating units derived from the norbornene monomer (A) and the content of repeating units derived from the aromatic vinyl compound (B) being 25 to 90 mol % based on the total repeating units, and the content of repeating units derived from the aromatic vinyl compound (B) being 0.55 to 10 (mol) times the content of repeating units derived from the norbornene monomer (A); and a molded article obtained by molding the norbornene addition copolymer. According to the present invention, a norbornene addition copolymer exhibiting excellent transparency, a high refractive index, and a small intrinsic birefringence value, and a molded article obtained by molding the norbornene addition copolymer are provided.

Claims

exact text as granted — not AI-modified
1 . A norbornene addition copolymer obtained by subjecting a norbornene monomer (A), an aromatic vinyl compound (B), and an α-olefin having 2 to 20 carbon atoms (C) to addition copolymerization, the sum of the content of repeating units derived from the norbornene monomer (A) and the content of repeating units derived from the aromatic vinyl compound (B) being 25 to 90 mol % based on the total repeating units, and the content of repeating units derived from the aromatic vinyl compound (B) being 0.55 to 10 (mol) times the content of repeating units derived from the norbornene monomer (A). 
   
   
       2 . The norbornene addition copolymer according to  claim 1 , wherein the norbornene monomer (A) has an aromatic ring as a substituent. 
   
   
       3 . The norbornene addition copolymer according to  claim 1 , having a negative stress-optical coefficient (C R ). 
   
   
       4 . A molded article obtained by molding the norbornene addition copolymer according to any one of  claims 1  to  3 . 
   
   
       5 . The molded article according to  claim 4 , which is used for optics.

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